Fuse.



20 5a? 5 5 62040? WSW A. W. SGHRAMM. FUSE.

APPLICATION FILED Nov. 29, 1911.

1,054,717. Patented Mar. 4, 1913;

E 2 .1 m 'In'; Z 8 g M w ADOLPH w. SGI-IRAMM, or RIVERTON, NEW JERSEY,

MANUFA UTURING COMPANY, TION OF PENNSYLVANIA.

Specificationof Letters Patent.

7 Application filed November 29, 1911.

Patented Mar. 4-, lwIS. Serial No. 663,058.

To all whom it may concern:

Be it knownthat I, ADO PH W. SorniAM vr, a citizen of the United States, residing in Riverton, Burlington county, New Jersey, have invented certain Improvements in Fuses, of which the following is a specification. One object of my invention is to provide a fuse structure particularly designed for application to a switch board or panel; the parts being so arranged as to facilitate the insertion and removal of the fuse cart-ridge.

Another object of the invention is to provide a novel form of holder or receiver for a cartridge fuse whose parts shall be so arranged as to make possible the application of the device to a switchboard at a minimum of expense while providing a substantial and eiiicient construct-ion.

I further desire to provide a novel form of receptacle for a cartridge fuse, including novel means for making connection with a switch and for holding said switch to the fuse-supporting structure.

Other objects of the invention are to provide a construction which incloses the fuse cartridge, occupies but a relatively small space at the front of the panel or slab 0n which it is mounted, has its electrical con .1S L plan of the nections at the back of said panel, is adapted for the reception of fuse cartridges of difi'erent lengths, is of such a nature as to easily be kept clean and is sight-1y in its appearance.

A further object of the invention is to provide an inclosed cartridge-fuse holder mounted on a supporting panel in such a manner that all the electrical connections shall be at the back of the panel, and the opening for the reception of the fuse cartridge shall be at the front thereof.

These objects and other advantageous ends I secure as hereinafter set forth, ref

erence being had to the accompanying draw- 1 standard 8 ings, in which Figure l, is a plan of a portion of a switch board showing my invention as applied thereto; F 2, is a vertical section of the structure shown in Fig. l, and illustrating a cartridge fuse as mounted in its holder; Fig. 3, is a fragmentary section similar to that shown in Fig. 2, but illustrating the free holding cap removed and the various parts in the corresponding positions; Fig. 4, rear of that part of the nut 4 is similarly screwed a cap 6 is provided to the sleeve beyond the nut &.

contact with the sleeve 2 body of the spring passes f l I, I.

a vertical section of another form of my invention.

In the above drawings, 1 represents a supporting structure-such as a slab of slate, marble or the like-having through it an opening in which is mounted a sleeve 2 threaded at both ends. n nut 3 is screwed on one end of this sleeve so as to lie close against one face of the slab l and a second on the opposite end of said sleeve so as to rest against the second'face of the slab; the sleeve being thus rigidly confined in position with a portion of its. threaded end extending beyond the nut 4.

Fixedly mounted within the sleeve 2 is a tube or lining 5 of insulating material and screw on the end of A fiat contact spring 6 is mounted adjacent the sleeve 2 on the rear face of the slab 1 with one of its ends held closely against said slab by means of a screw 7 hereafter referred to and is bent over parallel with this end so as to project over and be immediately adjacent the open end of the sleeve 2; the spring being, however, prevented from coming into by the projecting end of the insulating lining 5. here the over the head of the screw 7 it is provided with an opening as shown or it is cut away, to permit of the insertion or removal of said screw and at the same time cause a slight weakening at this point. The screw 7 passes through the slab l and serves to hold thereto a standard 8 forming one pole or terminal of a switch having a blade 9 and a second pole or terminal provided by a standard 10. This latter has its outer end constructed to make suitable electrical contact with the blade 9, which has a handle 11 and is pivoted to the at 12. The standard 10 is held to the slab by a screw 13 and in order to prevent it from turning or getting out of alinement with the blade 9, its face immediately adjacent the slab is transversely slotted to receive asmall plate 14 held in place by a screw 15, which also passes through the slab-and is held in place by a nut 16. The standard 8 is likewise prevented from turning by a plate 17 entering a suitable slot in its face next the slab 1, and this second plate is held in place by a ASSIGNOR TO ELECTRO DENTAL OI PHILADELPHIA, PENNSYLVANIA, A CORPORA- pressed when a screw 18 which passes from it through the slab 1. This screw 18 afterbeing threaded through the end of the spring 6, passes loosely through the body portion thereof; being finally provided with a nut 19 soldered or otherwise fixed to it to form a stop to limit the movement of the free end of said spring away from the fuse holder.

Under conditions of use a cartridge fuse X isplaced in the sleeve 2 through the opening provided by the removal of the cap 6*; the proportions of the various parts being such that when said cap is screwed upon the end of the sleeve 2, the spring 6 is moved from its position, shown in position shown in Fig. 2. An electric circuit is thereby established from the terminal on the nut 3 (formed in the present instance the screw 20), through the. sleeve 2, cap 6, the end y of the cartridge fuse, through the fuse within the cartridge to the end 3 thereof, thence to the spring 6, the screws 7 and 18, the standard 8 and thence through the switch blade 9 to the standard 10 and to the screws 13 and 15, either of which may serve as a terminal or attaching means for a current conductor. When the cap 6" is unscrewed, the spring 6 acts-to project the cartridge fuse into the position shown in Fig. 3 so that its end 'may be readily grasped for the purpose of removal; it being noted that normally the spring 6 is caused to exert pressure on the ends y and y for the purpose of making electrical contactregardless of different lengths of the cartridge. I

In Fig. 5, I have illustrated another form of my inventionin which that end of the tube 5 adjacent the back of the panel 1 has fixed to it a metal closure or cap 21. Within this cap is fixed a coiled or other suitable spring 6 designed to be more or less comfuse cartridge is inserted and confined in place by the cover 6*. strip of metal 22 is mounted on and clamped to the cap 21 bymeans of a screw 23, and may be connected to the bolt or screw 7 of the switch by a conductor 24: which-preferably is formed by a rolongation of the piece 22. The insulating tube 5 may be rigidly held in the sleeve 2 by any suitable means, as for example by indenting said sleeve at one or more points to force one or more conical projections into the wall of said tube as indicated at 5". The cap 21 may be similarly rigidly attached to the tube.

. I claim:

1. The combination in a holder for a cartridge fuse, of a plate having a hole therethrough; a cartridge fuse in said hole; a

.spring projecting over one end of the hole;

and means acting on the fuse in opposition to the spring to retain the latter in the hole. 2. The combination in a fuse holder, of

Fig. 3, to theholding it to a plate having a hole therein; a spring projecting over one end of said hole 111 position to be engaged by a cartridge fuse therein; and a holding device removably mounted on the plate at the opposite end of hole for retaining the fuse in engagement with the spring. '3. The combination of a plate of insulating material; a tube extendingthrough the same; a spring at one end of said tube; a cap threaded on the tube for holding a cartridge fuse in the same inepgagement with the spring; and terminalselectrically connected to the tube and to the spring; said terminals both being adjacent that face of the insulating plate distant from the cap.

'4; The combination in a fuse holder, ofa plate of insulating material having a hole therein; a metal tube extending through said hole; an insulating lining in the tube; caps for the opposite ends of the tube; one cap being removable; a spring in the other cap; and terminals respectively connected to the tube and to one of the caps for including a fuse in said tube in an electric circuit.

5. The combination in a fuse holder of a plate of insulating material having a hole therein; a spring mounted adjacent the hole; means for'retaining a cartridge fuse in the hole with one end in engagement spring; and a terminal connected to said means for including the fuse and the spring in an electric circuit. 4

6. The combination in a fuse holder of a supporting structure of insulating material; an electric switch having recessed standards and members holding the standards to said supporting structure; a piece entering the. recess of each standard; and means for holding each of said pieces in place to prevent turning of the standards.

7 The combination in a fuse holder of a supporting structure of insulating material; an electric switch having a plurality of-standards each having a recess in its with the under face; screws mounted in the supporta ing structure and respectively holding the standards thereto; metallic pieces respectively entering the recesses of the standards; and means for fixedly holding said pieces ,to the supporting structure.

8. The combination in a fuse holder of a supporting structure of insulating material having a passage therethrough; a metallic tube mounted in said passage; nuts mounted on the opposite ends of the tube and rigidly the supporting structure; one of said nuts having a terminal; an insulating tube in the metallic tube; two'cap's at opposite ends of theholder; one being removably mounted on the metallic tube and the other on the, insulating tube; and a sec-- ust ' one of said nuts having a terminal; an insulating tube in the metallic tube; a cap fixed to and closing one end of said insulating tube; a second terminal connected to the said cap; anda second cap for the tube reinovably mounted on-the other end thereof;

with a spring for insuring good electrical connection between a cartridge fuse in the tube and the caps of sald tube.

10. The combination of a body of insulating material; a tubular structure 1nounted therein and open at the ends 1; a spring mounted on said insulating body and having one end extending over the opening of the tubular structure; and means mounted on the opposite end of the tubular structure for holding the cartridge fuse in electrical engagement with the spring.

11. The combination of a supporting structure; a tube mounted in the same and threaded at one end; a fiat spring mountthe supporting structure;

ed on the supporting structure and having a portion extending over the end of said tube so as to be movable toward and from the same; with a cap threaded on the opposite end of the tube for holding the cartridge fuse in engagement With the spring; and terminals electrically connected to the tube and to the spring.

12. The combination of a supporting structure of insulating material having a passage therethrough; a metallic tube mounted in said passage; nuts mounted on the opposite ends of the tube and rigidly holding it to the supporting structure; one of said nuts having a terminal; an insulating tube in the metallic tube; a spring mounted on the back of the supporting structure and extending over the adjacent end of the tube; and a terminal connected to said spring.

' In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

ADOlZPH W. SCHRAMM. Witnesses WILLIAM E. BRADLEY, Jos. H. KLEIN. 

